| 1 | # sys_random_h.m4 serial 8
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| 2 | dnl Copyright (C) 2020-2022 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | AC_DEFUN_ONCE([gl_SYS_RANDOM_H],
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| 8 | [
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| 9 | AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
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| 10 | dnl <sys/random.h> is always overridden, because of GNULIB_POSIXCHECK.
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| 11 | gl_CHECK_NEXT_HEADERS([sys/random.h])
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| 12 | if test $ac_cv_header_sys_random_h = yes; then
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| 13 | HAVE_SYS_RANDOM_H=1
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| 14 | else
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| 15 | HAVE_SYS_RANDOM_H=0
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| 16 | fi
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| 17 | AC_SUBST([HAVE_SYS_RANDOM_H])
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| 18 |
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| 19 | m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
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| 20 | if test $ac_cv_header_sys_random_h = yes; then
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| 21 | UNISTD_H_HAVE_SYS_RANDOM_H=1
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| 22 | fi
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| 23 |
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| 24 | dnl Check for declarations of anything we want to poison if the
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| 25 | dnl corresponding gnulib module is not in use.
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| 26 | gl_WARN_ON_USE_PREPARE([[
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| 27 | #if HAVE_SYS_RANDOM_H
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| 28 | /* Additional includes are needed before <sys/random.h> on uClibc
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| 29 | and Mac OS X. */
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| 30 | # include <sys/types.h>
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| 31 | # include <stdlib.h>
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| 32 | # include <sys/random.h>
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| 33 | #endif
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| 34 | ]],
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| 35 | [getrandom])
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| 36 | ])
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| 37 |
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| 38 | # gl_SYS_RANDOM_MODULE_INDICATOR([modulename])
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| 39 | # sets the shell variable that indicates the presence of the given module
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| 40 | # to a C preprocessor expression that will evaluate to 1.
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| 41 | # This macro invocation must not occur in macros that are AC_REQUIREd.
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| 42 | AC_DEFUN([gl_SYS_RANDOM_MODULE_INDICATOR],
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| 43 | [
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| 44 | dnl Ensure to expand the default settings once only.
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| 45 | gl_SYS_RANDOM_H_REQUIRE_DEFAULTS
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| 46 | gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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| 47 | dnl Define it also as a C macro, for the benefit of the unit tests.
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| 48 | gl_MODULE_INDICATOR_FOR_TESTS([$1])
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| 49 | ])
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| 50 |
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| 51 | # Initializes the default values for AC_SUBSTed shell variables.
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| 52 | # This macro must not be AC_REQUIREd. It must only be invoked, and only
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| 53 | # outside of macros or in macros that are not AC_REQUIREd.
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| 54 | AC_DEFUN([gl_SYS_RANDOM_H_REQUIRE_DEFAULTS],
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| 55 | [
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| 56 | m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS], [
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| 57 | gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETRANDOM])
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| 58 | ])
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| 59 | m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS])
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| 60 | AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
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| 61 | ])
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| 62 |
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| 63 | AC_DEFUN([gl_SYS_RANDOM_H_DEFAULTS],
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| 64 | [
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| 65 | dnl Assume proper GNU behavior unless another module says otherwise.
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| 66 | HAVE_GETRANDOM=1; AC_SUBST([HAVE_GETRANDOM])
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| 67 | REPLACE_GETRANDOM=0; AC_SUBST([REPLACE_GETRANDOM])
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| 68 | ])
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